Great for hot flashes and night sweats EUC The Opal Cool Pad features specially formulated 80° phase change material that feels surprisingly cool against your 98.6° degree body. Sit or lay on the pad to feel a soothing cool rush through your core. The cool relief lasts for up to two hours and does not require refrigeration. Re-cools at room temperature, ready for your next use. Take the it with you to work, your office chair, car, for wheelchairs or hospital beds. Size: 20″ x 15″.